In Excitation-Contraction Coupling

question 108

Multiple Choice

In excitation-contraction coupling,

• A)calcium ions must bind with myosin to expose active sites on actin.
• B)myosin heads bind to exposed active sites on actin.
• C)cross-bridges form between myosin heads and calcium ions.
• D)movement of the troponin-tropomyosin complex causes actin myofilaments to slide.
• E)ATP binds to actin myofilaments.

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